Patchday: Windows 8.1/Server 2012 Updates (February 9, 2021)

Windows Update[German]As of February 9, 2021, Microsoft has released various updates for Windows 8.1. However, these updates are also available for Windows Server 2012 R2. Here is some information about them.


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Updates for Windows 8.1 und Windows Server 2012 R2

A rollup and security-only update have been released for Windows 8.1 and Windows Server 2012 R2. The update history for Windows 8.1 and Windows Server 2012 R2 can be found on this Microsoft page.

Important: As of July 2020, all Windows updates disable the RemoteFX vGPU feature due to vulnerability CVE-2020-1036 (see also KB4570006). After installing this update, attempts to start virtual machines (VM) with RemoteFX vGPU enabled will fail.

In addition, Adobe’s Flash Player support expired on December 31, 2020, and Flash will no longer be supported as of January 12, 2021.

KB4601384 (Monthly Rollup) for Windows 8.1/Server 2012 R2

Update KB4601384 (Monthly Rollup for Windows 8.1 and Windows Server 2012 R2) contains improvements and fixes, and addresses the following issues.

  • Addresses historical daylight saving time (DST) updates and corrections for the Palestinian Authority.
  • Addresses an issue with German translations of Central European Time.
  • Security updates to Windows App Platform and Frameworks, Windows Hybrid Cloud Networking, and Windows Core Networking.

This update is automatically downloaded and installed by Windows Update, but is also available from the Microsoft Update Catalog sowie and via WSUS. If installing manually, the latest Servicing Stack Update (SSU KB4566425  dated July 14, 2020) must be installed beforehand – although this SSU cannot be uninstalled.

Microsoft is aware of the following issue related to the update: Certain operations, such as renaming, that you perform for files or folders on a Cluster Shared Volume (CSV) may fail with the error “STATUS_BAD_IMPERSONATION_LEVEL (0xC00000A5)”. This occurs when you perform the operation on a CSV owner node from a process that does not have administrator privileges. The KB article suggests a workaround to fix this.

KB4601349 (Security-only update) for Windows 8.1/Server 2012 R2

Update KB4601349 (Security Only Quality Update for Windows 8.1 and Windows Server 2012 R2) addresses the following items.


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  • Adds historical daylight saving time (DST) updates and corrections for the Palestinian Authority.
  • Addresses an issue with German translations of Central European Time.
  • Security updates to Windows App Platform and Frameworks, Windows Hybrid Cloud Networking, and Windows Core Networking.

The update contains the same fixes as the rollup update and it is distributed via WSUS or available from the Microsoft Update Catalog. If installing manually, install the latest Servicing Stack Update (SSU) KB4566425 beforehand. It has the same known bugs as the rollup update, details about the update are described in the KB article. I did not find a security update for Internet Explorer 11.

Similar articles:
Microsoft Office Patchday (February 2, 2021)
Microsoft Security Update Summary (February 9, 2021)
Patchday: Windows 10-Updates (February 9, 2021)
Patchday: Updates for Windows 7/Server 2008 R2 (February 9, 2021)
Patchday: Windows 8.1/Server 2012 Updates (February 9, 2021)
Patchday Microsoft Office Updates (February 9, 2021)


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